ABB Advant Controller 450 User Manual

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3-48 3BSE 002 415R701 Rev A
Table 3-12 includes some technical terms which require explanation:
• ,QWHUUXSW means that the execution of the input signal software (the DB function) is
initialized by the process signal change of state.
• &\FOLF means that the input is scanned cyclically. Normally, the scan rate configured is the
same scan rate used for the PC program scan rate.
• /RZKLJK change frequency relates to the actual PC program scan rate. That is low means
that the time between changes is much longer than the time between PC element
executions (determined by the PC program scan rate). High means that the time between
changes has the same magnitude as the time between PC element executions.
Complexity: 2 - 4-input AND gates per digital signal.
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DI
Interrupt, low change frequency
0.02 Hz (50 s) 0.3%
0.1 Hz (10 s) 0.8%
DI
Interrupt, high change frequency
(This design should be avoided)
0.5 Hz (2 s) 3.2%
1 Hz (1 s) 6.2%
DI
Cyclic, low change frequency
0.02 Hz (50 s) 0.4%
0.1 Hz (10 s) 0.5%
DI
Cyclic, high change frequency
0.5Hz (2 s) 0.7%
1 Hz (1 s) 0.9%
DO
Low change frequency
0.02 Hz (50 s) 0.4%
0.1 Hz (10 s) 0.5%
DO
High change frequency
0.5Hz (2 s) 1%
1 Hz (1 s) 1.8%

ABB Advant Controller 450 Specifications

General

Brand	ABB
Model	Advant Controller 450
Category	Controller
Language	English